ESXi Host is not reachable from vCenter Server

[MariusEl]

Hi Community,

I have the situation, that one of my ESXi Host, is sometimes nocht reachable from my vCenter. So I cannot reach the ESXi Host by ping from the vCenter. If I make a ping from my client I can reach the ESXi Host.

If I'm connected with SSH or vSphere (from my client) I can manage the Host, so I have restartet the management Network -> Did not help

- /etc/init.d/hostd restart

- /etc/init.d/vpxa restart

and I tried this

-services.sh restart

and I tried to restart the Managment Network by the DCUI

I also restarted the vCenter Server -> Did not help

I also checked the Firewall etc, but there were no changes! (the other Host at the Cluster is connected)

And I can ping the VM's which are running at the ESXi Host, which is not reachable.

Thanks for some Idea

Marius

[AmzSannegowda]

Hi Marius,

                      So if that host was previously added to vcenter server, Is it now showing disconnected when you see from vc??

Thanks,

Amz

[BoneTrader]

Hello MariusEl,

are you running the vCenter Appliance oder are you running a Windows Server with vCenter?

- which version of vCenter / vSphere are you running?

- are all your hosts the same patch version?

-. have you checked your Management Switch Ports / Mgmt NIC(s)

regards

[MariusEl]

Hi Amz,

the ESXi host is shown as disconnted.

And I cannot reconnect, because only from the vCenter Server I cannot reach the Host but from all other systems!

Regards

Marius

[MariusEl]

Hi Bone,

it is a windows vCenter Server.

vCenter is 5.5 also the vSphere Client!

both Hosts have the same Patch level (ESXi 5.5.0 - 2718055)

Switch Ports looks ok

Regards

Marius

[BoneTrader]

check your Network/Firwall setting again. -> Port 902 / UDP

also check these

VMware KB: ESXi/ESX host disconnects from vCenter Server after adding or connecting it to the invent...

VMware KB: ESX/ESXi host keeps disconnecting and reconnecting when heartbeats are not received by vC...

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=102991...

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=100340...

[kiranht]

I have a question , is there any different VLAN configured for Management network and VM network ?

[praveenkv]

Refer below link :

VMware KB: Determining why an ESX/ESXi host does not respond to user interaction at the console

[impranayk]

-Make sure that VLAN is configured properly for ESXi management network.

-Try swapping NIC for management port.

- If nic0 and nic1 are selected, try checking each nic by disabling other from DCUI.

Thanks!

Pranay